I suspect the per-book cost of DRM is a good deal higher than your hypothetical figure, too. I can't see it being able to sustain companies like Mobipocket at that level. I think you're correct, too, in that the main thing publishers need to realize is that it doesn't prevent piracy. Nothing prevents piracy 100%. The best you can do is encourage people to pay for their content by making it convenient and reasonably priced.
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